Antibiotic from {i micromonospora purpurea

ABSTRACT

A mutant strain of Micromonospora purpurea herein designated M. purpurea JI-20 elaborates an antibiotic complex comprising gentamicin and at least two novel antibiotic substances namely Antibiotic JI-20A and Antibiotic JI-20B. The so-produced antibiotics have an adverse effect upon the growth of grampositive and gram-negative bacteria.

United States Patent Ilavsky et a1.

Sept. 2, 1975 ANTIBIOTIC FROM MI CROM ONOSPORA PURPUREA lnventors: Jan Ilavsky, Livingston; Aris P.

Bayan, New Brunswick; William Charney, Montclair; Hans Reimann, Wayne, all of NJ.

Assignee: Schering Corporation, Kenilworth,

Filed: Nov. 9, 1973 Appl. No.: 414,492

Related U.S. Application Data Continuation-impart of Ser. No. 261,753, June 12, 1972, abandoned.

U.S. Cl 260/210 AB; 424/181 Int. Cl. C07H 15/20 Field of Search 260/210 AB [56] References Cited UNITED STATES PATENTS 3,651,042 3/1972 Marquez et a1. 260/210 AB 3,661,892 5/1972 Shomura et a1 260/210 R Primary Examiner-Johnnie R. Brown Attorney, Agent, or FirmCarver C. Joyner; Raymond A. McDonald; Stephen B. Coan [5 7] ABSTRACT 8 Claims, 4 Drawing Figures PATENTED 2|975 3, 903.072

ANTIBIOTIC Jl-ZOA FIG. 1

ANTIBIOTIC Jl-ZOB FIG. 2

ANTIBIOTIC Jl-ZOA SULFATE SALT FIG. 3

ANTIBIOTIC Jl-ZOB SULFATE SALT FIG. 4

NEW ANTIBIOTIC FROM MICROMONOSPORA PURPUREA This application is a continuation-in-part of our copending application Ser. No. 261,753, filed June 12, 1972 now abandoned.

BACKGROUND OF THE INVENTION The importance of antibiotics in the treatment of animal and plant infections, and as growth fractors is well known. The present invention provides a new antibiotic complex, the antibiotics being produced by an Ac'tinomycete from the genus Micmmonosporu. The new antibiotic complex is herein designated Antibiotic J 1-20 and the chemical, physical and biological properties set forth herein distinguish the components of the complex from all heretofore known antibiotics.

SUMMARY OF THE INVENTION Cultivation of a mutant stain of Micromonospora purpurea NRRL 2953 (Micromonospora purpureu JI-) in a suitable culture medium produces a composition having substantial antibiotic activity. The composition i.e. Antibiotic J 1-20 complex consists of a very small quantity of gentamiein, plus a larger quantity of at least two novel components, namely Antibiotic J I-2OA and Antibiotic Jl-2OB.

THE MICROORGANISM Micronmnospora purpurea .lI-2O is very similar in taxonomical and morphological properties to M. purpm'ea NRRL 2953 which are described in US. Pat. No. 3,091,572, issued May 28, 1963. In fact few significant differences in such properties have been noted. However, despite the fact that the mutant strain is quite similar to M. purpureu NRRL 2953 it has two distinguishing strain characteristics; one that it produces an antibiotic complex which differs substantially from that of the parent. Secondly, unlike M. purpurea, which usually produces a purple pigment, the mutant strain may produce diffusible pigments of various colors and shades, such as, red, pink, yellow, brown and graygreen. A typical strain of Micmmmwspom purpureu 11-20 has been deposited at the Northern Utilization Research and Development Division, US. Department of Agriculture, Peoria, Illinois where it was given the accession number NRRL 5467.

The mutant strain Micromonosporu purpurea JI-2O was initially produced by the treatment of Micrunwnospom purpureu NRRL 2953 with nitrosoguanidine followed by strain selection. It is apparent that to those skilled in the art that other mutagenie agents and other standard techniques may be used to obtain microorganisms that are the equivalent of M. purpureu .ll-20.

Table I sets forth the morphological properties of Micromo:import: purpurea J I-2() and subsequent tables set forth additional data which enable taxonomic placement of the microorganism. In describing the color formation the following system and reference are employed: The color designation consists of two designates. The first is a color name taken from the Descriptive Color Name Dictionary", by Taylor, Knoche and Granville, published by the Container Corporation of America, I950 (U.S.A. with a color chip number corresponding to the color name; said chip number taken from the Color Harmony Manual, 4th edition, 1958, published by the Container Corporation of TABLE I Morphology of Micromonospora purpurea .lI-2O Medium: 3% NZ Amine Type A, 171 Dextrose, 1.5% Agar Observations Macroscopic Microscopic Growth moderate, plicate, no diffusible pigment, no aerial mycclium. Color g4lc dusty orange. moderate orange 53 Spores not observed on any of the media. Mycelium not fragmenting in young cultures but may undergo lysis in old cultures. Mycelium 0.4

0.6 am in diameter.

TABLE II Colony Descriptions of Micromonospora purpurea Jl-ZO on Various Media Media Observations Glucose Asparagine Agar Growth moderate, plicate, no aerial mycelium, no diffusible pigment, color: surface: gSpe terracotta; strong brown 55. Reverse gSpg henna; strong brown 55.

Growth good, plicate, no diffusible pigmenpno aerial I mycelium, hydrolysis positive ,I (-H-k); surface color: g3ic light amber: dark orange yellow 72 Growth good. plicatc. dark maroon Growth good, plicate, dark maroon Growth fair, cellulose undergoing decomposition Growth good. plicate, no diffusiblc pigment, no aerial mycelium; color: surface center: g4gc nude, tan; light brown 57. Periphery: g5lg cocoa brown: moderate reddish brown 43. Reverse m4pg dark luggage tan. strong brown 55.

Growth moderate, plicate membranous, no diffusible pigment, no aerial mycelium, color: surfacc:g5le rust tan: grayish reddish orange 39. Reverse g4nc luggage tan; strong brown 55.

Growth good, plicate membranous no diffusible pigment. no

aerial mycelium; color: surface g4la orange; strong orange 50. Reverse not detectable Growth moderate, plicate membranous, no diffusible pigment, no aerial mycelium, color: surface g5pe terra cotta; strong brown 55. Reverse mSpe terra cotta, brownish orange 54.

Growth good, plicate membranous, no diffusible pigment, no aerial mycelium, color: surface g3gc light tan; light yellowish brown 76. Reverse m3lc cinnamon: light yellowish brown 76.

lll-(Growth good) Growth poor) g8pc (periphery) burgundy; dark reddish brown 44 g5ic (center) light persimmon; moderate reddish orange 37. Growth moderate. plicate. no diffusihle pigment, no aerial mycclium, color: surface Milk Sucrose Starch Cellulose Bennett's Agar Emersons Agar Tomato Paste Oatmeal Agar Glucose Asparagine Agar Glucose Yeast Extract Agar Potato Sucrose Nitrate Agar (Clapeks Agar) TABLE ll-Continued Colony Descriptions of Mieromonospora purpurea .Ilon Various Media Growth poor. slight brown diffusible pigment Observations at 2.7. and l4 days after Gordon and Smith J. Bact. 691M?) Peptonc Growth poor. no reaction Iron Agar Observations at 2.

7. and l4 days Litmus Milk Milk completely peptonized.

acid reaction TABLE III Utilization of Nitrogen Sources by Micromonospora purpurea Jl-20 Nitrogen Source +1 "/1 glucose Growth moderate. membranous to plicate. no diffusible pigment. no aerial mycclium; color: surface g7l/2l g rose mauve; dark grayish purple Z29. Reverse mopi brown mahogany; moderate reddish brown 43.

Growth moderate. membranous. no diffusible pigment. no

aerial mycelium mycelium. color surface: gl0ni egg plant; dark reddish purple 242. Reverse mopi brown mahogany; moderate reddish brown 43.

Growth poor. flat. no diffusible pigment. no aerial mycelium. surface color g7-I/2pi dark wine; dark reddish brown 44. Reverse m7-l/2pi dark wine; dark red In.

0.571 Difco Yeast Extract l.0 NZ Amine Type A l7r Asparagine The microorganism generally tolerates up to 3 percent sodium chloride. Further. the microorganism grows well at temperatures between and 38C. grows poorly above 38C and exhibits substantially no growth at 45C or above.

The microorganism is variable with respect to nitrate reduction giving a positive reaction sometimes and a negative reaction at other times. The variability may be associated with the vigor with which the culture is growing at the time the test is performed.

The carbohydrate utilization pattern of A/Iicmmmmspom J l-20 is substantially as follows:

The microorganism exhibits good growth on sucrose, Xylose and mannose. lts growth on L-arabinosc, glucosc. lactose. starch and ribosc is moderate. On cellulose. galactose. levulosc. raffinose. rhamnose. inositol. mannitol, sorbitol. glycerol. melizitose. D-arabinosc. salicin and oz-mclibiosc, the microorganisms growth ranges from fair to poor. The control medium in which the growth tests were effected consists of 0.5 percent yeast extract without added carbohydrate upon which medium growth is poor. Thus, any improvement in the growth characteristics of the microorganism is due to the utilization of the carbohydrate.

THE F ERMENTATION The fermentation of Mic-romanuspuru purpurea J [-20 to produce an antibiotic complex is usually affected in two and sometimes in three stages (i.e. germination and production). The first stage or the first two stages are devoted to germination of the microorganism to produce a suitable inoculum and is usually effected at temperatures within the range of from about 25 to about 35C for l to 4 days. Further, the germination stage is effected under aerobic conditions with agitation, preferably rotary agitation. The production stage is commcnced by inoculating, under sterile conditions. a suitable mcdium with the previously prepared inoculum. This stage of the fermentation is usually effected at about the same temperature range as the germination stage and usually requires from about 4 to about 7 days. However. unlike the germination stage where the pH usually remains fairly stable. the production stage requires regulation of the pH to keep it within the preferred range of from about 6.7 to about 8.3. It is also usually necessary during the course of the fermentation to add suitable agents to minimize foaming. Such agents are widely known in the art and are commercially available. For example. a very suitable agent is GE-60, a silicone type antifoam agent which is a trademarked product of General Electric. During the course of the fermentation. and particularly after the first 24 hours, samples of the whole broth are taken for assay, (such as the one described below) to determine when peak antibiotic production is reached. When peak production is attained. the antibiotics are isolated by the methods generally used for basic antibiotics. Exemplary of such methods are ion exchange resin extraction utilizing such cationic resins as IRC- (Rohm and Haas, Philadelphia. Pennsylvania). Lewatit CNP (Farbcn Fabriken Bayer, Leverkusen Germany), or the like. Further methods of isolation include solvent extraction of a suitable derivative (cg. a Schiff base adsorption on activated carbon or the like.

THE ASSAY Peak antibiotic production is determined by a discplate assay which uses Slap/1ylocuc'cz1s uureus ATCC 6538P as the test organism and which is performed substantially as described by Oden. ct al. Antimicrobial Agents and Chemotherapy. 1963. pages 8 134 The reference standard is Antibiotic Jl-20B base having an assigned potency of 1000 meg/mg. One l microgram of the standard in one l ml. of 0. l M phosphate buffer at pH 8.0 elicits a zonal response of 168i 1.5 mm. The standard Antibiotic Jl-20B sulfate assays 730 meg/mg against the standard base. Antiobiotic 1]- 20A base and the corresponding sulfate assay 723 meg/mg. and 527 meg/mg. respectively. when assayed against the standard Antibiotic .ll-20B base.

THE ANTIBIOTIC H3 As previously stated the product elaborated by M1'- t-romonospum Jl-ZO is an antibiotic complex. When H NH separated by a chromatographic method described 0H 2 hereinafter, gentamicin (i.e. gentamicin C C and C 5 {HCHS HG is the first to emerge. It is followed by AntibioticJl-ZOB which is usually the most abundantly produced com- H NCHR pound. The last compound to emerge is Antibiotic Jl- A.

The structure, physicochemical and biological properties of the components of gentamicin are well known having been reported in the Journal of Infections Dis- H NR2 eases Vol. 1 19, numbers 4 and 5, University of Chicago Press.

The physicochemical properties of the components wherein R is a member selected from the group consistof the Antibiotic .ll-ZOA and Antibiotic Jl-ZOB are subing of hydrogen and methyl. In Antibiotic .lI-20B, R is stamiauy as Set forth below: methyl. ln Antibiotic JI-ZOA, R is hydrogen.

Antibiotic JI-ZOA Antibiotic Jl-ZOB Optical Rotation (\vaterflozl +l60 +l72 =U.37( pKa 8.1 8.1

Microanalysis Found Carbon 45.66% 46.47% Hydrogen 8.18% 8.4571 Nitrogen 13.53% 13.93% Calculated Empirical Formula C ,H;, ,N -,O,,.H. ,O C ,H N -,O,,.H O N.M.R. Spectrum Figure l Figure 'l Sulfate Salt The compounds of this invention (i.e. Antibiotic JI- ZOA and Antibiotic .ll-ZOB) may also be depicted Jl-2()A 11-203 stereochemically as set forth in Formulae la and lb, re-

s ectivel Carbon 30.64 30.73 p y Hydrogen 6.55 6.70 Nitrogen 8.78 8.7l 40 CHENHE NH2 N.M.R. Spectrum As shown in As shown in O Figure 3 Figure 4 2 Calculated Empirical C H- N Q l /z C:,,H N -,O .2 H OH Formula H 50 .l AH O H SO ZH O Antibiotic Jl-2O complex, the novel components thereof (i.e. Antibiotic Jl-2OA and Antibiotic 11-208), and their acid addition salts form hydrates with water and solvates with polar organic solvents (e.g. alcoholates). These hydrates and solvates are the full biologi- Ia cal equivalent of the basic antibiotic and their acid addition salts. They merely represent a form in which the antibiotics may be facilely recovered from solution. I

Antibiotics JI-ZOA and JI-ZOB have characteristic nuclear magnetic resonance spectra as are shown in FlGS. 1 and 2, and their sulfates in FIGS. 3 and 4, respectively. These N.M.R. spectra were obtained by the use of a Varian A--A spectrometer Varian Associates, 60 6! l Hansen Way, Palo Alto, California) on a solution of the antibiotic in deuterated water. The spectra are recorded in parts per million (PPM) using the HDO band at 4.61 PPM as the internal standard. H D

The components of theAntibiotic 11-20 complex i have the gross (flat) structures depicted by Formula 1. CH3 However, no conclusions relative to stercochcmistry H3 are to be drawn from the formula: H 11 As can be seen by Formulae la and lb, Antibiotic 11- A and Antibiotic Jl-20B are aminoglycoside antibiotics, which belong to the class that includes gentamicin, streptomycin, neomycin, paromomycin, sisomicin,

of Antibiotic JI-20A and Antibiotic .II-ZOB are generally prepared by titrating the free nitrogen base with acid. The salt is, advantageously, isolated by precipitation from an aqueous solution by a water miscible organic solvent, preferably a lower alcohol or by lyophilizing an aqeous solution of said salt. Such salts are generally derived from inorganic acids, such as the mineral acids and from hydrocarbon carboxylic acids such as the aliphatic acids including straight chain, branched chain and cyclic aliphatic acids; aromatic hydrocarbon carboxylic acids and aralkyl hydrocarbon carboxylic acids. Exemplary of such acids are sulfuric, hydrochloric, phosphoric, cyclopropanecarboxylic, adamantane carboxylic, benzoic, pivalic, phenylacetic, acetic, propionic, caproic, stearic and oleic acids.

Similarly, the pharmaceutically acceptable Schiff base-oxazolidine derivatives of Antibiotic Jl-20A and Antibiotic .lI-ZOB are generally prepared by treating an alcoholic solution of the antibiotic base with an excess of aldehyde at or above ambient temperature for about one hour, chilling the solution to obtain the desired product, usually in the form of a crystalline solid. Alternatively, these derivatives may be isolated by precipitation from a concentrate of the reaction mixture. As can be seen from Formula I, the antibiotic has four primary amino groups, each of which can form a Schiff base. Further, the antibiotic has a secondary amino group vicinal to a tertiary hydroxy group, which on combination with an aldehyde gives rise to an oxazolidine ring. Thus when the antibiotic is reacted with an excess of aldehyde, five moles of aldehyde react with each mole of antibiotic to yield the Schiff base-oxazolidine derivative depicted by formula ll.

wherein R is a member selected from the group consisting of hydrogen and methyl; R HC= is an alkylidene radical containing 2 to 12 carbon atoms; a cycloalkylidene radical containing 4 to 12 carbon atoms; an aralkkanamycin, and the like. The members of this class are 5 ylidene radical containing 7 to 12 carbon atoms; or an basic antibiotics and are capable of being converted to heterocyclic radical containing 6 to 12 carbon atoms. certain non-toxic pharmaceutically acceptable deriva- Representative of various aldehydes which upon retives having substantially the same antibiotic utility as action with the Antibiotic J [-20 complex and the comthe antibiotic free base, usually differing only in degree. onents thereof so as to provide a derivative of formula Among such derivatives are acid addition salts and 10 II are: acetaldehyde, propionaldehyde, butyraldehyde, Schiff base-oxazolidine derivatives. crotonaldehyde, furfural, cyclopentylacetaldehyde,

1% Oil 0 R HC-- CH i=CHR R HC=NCHR N=CHR The pharmaceutically acceptable acid addition salts vanillin, veratraldehyde, benzaldehyde, p-nitrobenzaldehyde, salicylaldehyde, pyridoxal and the like.

These Schiff base-oxazolidine derivatives are not ap preciably soluble in water but are soluble in most commonly used organic solvents such as chloroform, methanol, acetone, ethyl acetate and the like. Further, the Schiff-base-oxazolidine derivatives are usually unstable in organic solvent containing traces of water and tend to revert to the free antibiotic. The presence of a trace amount of acid facilitates the reversion.

Biological Activity of Antibiotics .lI-20 Complex, JI-ZOA and Jl-20B Antibiotic 11-20 complex exhibits substantial antibacterial activity when tested in vitro in Mueller-Hinton broth. The minimum inhibitory concentration against 32 strains of Escherichia coli ranged from 0.3 to 50 meg/m1.

The individual components and therefore the complex, exhibit a broad spectrum of in vitro antibacterial activity. In the table set forth below are test results after 24 hours incubation against representative gram positive and gram negative bacteria. These data were also obtained from tests performed with Mueller-Hinton broth, the values being expressed in terms of the antibiotic free base although the tests are actually performed with the sulfate salt.

MlC (meg/ml) Organism Antibiotic Jl-20A Antibiotic 11-208 Staphylococcus aureus 70 3.0 3.0 Staphylococcus aureus 2059 7.5 7.5 Staphylococcus aureus 45 0.3 0.3 Escherichia coli 11775 0.3 0.8 Escherichia coli 12740 0.3 0.3 Klebsiella pneumoniae 18 7.5 17.5 Klebsiella pneumoniae 13883 7.05 0.08 Klcbsiella rhinoscleromatis 18804 0.05 0.08 Proteus mirabilis 8019 0.8 0.8 Pseudomonas aeruginosa 59 3.0 7.5 Pseudomonas aeruginosa 60 3.0 17.5

l Antibiotic Jl-20A annd Antibiotic JI-2OB exhibit an PREPARATION OF STOCK CULTURE aPtlon agamst pa'thogemc f f' Prepare and sterilize a series of 300 ml. shake flasks g Induce? 1 labortoryhml'lmzfls and m 'f with a medium having the following composition: beef t z f w g i g p g fg extract (0.3%), tryptone (0.5%), yeast extract (0.5%), O i l 3 dgaims i a n e 20 soluble starch (2.4%), dextrose (0.1%), calcium carbacterial origin in mice, mice were dosed twice with the bonate I 7 and water 100 ml A ercema es are individual antibiotic, with a solution or a suspension in o p g I expressed as weight to volume.) inoculate each flask an aqueous vehicle containing 0.5 percent carboxym ethybc enul Os e (CMC), once immediately before an with colonies of Mzcromonospora purpurea .ll-2O from intraperitoneal injection of the infecting bacteria and a Sterne needle or loop- Fermem the 'l for from once 4 hours after such injection. The number of surviabout 48 to about 72 hours at about 28 C with rotary vors was determined 48 hours after infection and that agltatlondata analyzed by Standard probit procedures to d Prepareand sterilize a series of 3 liter flasks containmine PD values with 95 percent confidence limits. ing 1 liter of the above-described medium and inocu- The following chart sets forth the protective activity of 30 late with -100 ml. of the fermentation mixture from the antibiotics against a pathogenic bacteriumabove. Repeat the above-described fermentation, and

Protection Tests in vivo (Mouse) PD, mg/kg Infecting Organism Antibiotic .ll-20A Antibiotic .ll-20B Staphylococcus aureus 29 14.0 Gray 979 3.0 2.8 Streptococcus pyogenes C2V 40.0 '40.0 Pseudomonas aeruginosa 413 i 50.0 50.0 7 1516-7 50.0 50.0 Escherichia coli 626 15.0 15.0 11775 4.0 8.0 Salmonella sp. S.C. 3.0 4.5

Acute Toxicity V LDSU 1.v. 1 15 115 Antibiotic 11-20 complex or the novel components thereof (.ll-2OA or J l-2OB) and their acid addition salts may be used alone or in combination with detergents and/or other antibacterial agents to prevent the growth of, or to reduce the number of susceptible organisms especially those set forth hereinabove. Thus, the antibiotics may be used in wash solutions for sanitary purposes, as in the cleaning of laboratory glassware and equipment. Further, they may be used for laundering purposes, such as a bacteriostatic rinse for laboratory uniforms.

The total antibiotic complex consisting of gcntamicin, Antibiotic .ll-20A and Antibiotic Jl-20B may also. be utilized for the above-mentioned purposes. Thus, the necessity for separating the antibiotic mixture may be obviated.

The Schiff base-oxazolidine derivatives of the antibiotics are especially useful as bacteriostats in'oils and greases such as oil-based paints, cutting oils, lubricating greases and the like.

EXAMPLE 1 Production of Gentamiein and Antibiotic 11-20 Complex A. lnoculum Preparation Prepare and sterilize a nutrient medium consisting of the following materials: beef extract (3 gms); tryptone (5 gms); dextrose 1 gm.); soluble starch (24 gms); yeast extract (5 gms); calcium carbonate 1 gm.) and water 1 liter in a 3 liter shake flask. Cool the sterile medium to about 25C and inoculate with 5 percent (v/v) of a previously prepared stock culture of Micmmonospara purpureu .Il-20. Allow the culture to grow for from about 48 to about 72 hours at 28C with rotary agitation at about 280 rpm. B. Second lnoculum Using a 10 liter aerated and agitated fermentor, prepare and sterilize the following medium: Soybean meal (210 gms.); dextrin (300 gms.); cerelose (30 gms.); calcium carbonate (42 gms); cobalt chloride l2 mgms); GE-60 antifoam (3 ml.) and water to 6 liters. Transfer under aseptic conditions, 600 ml. of the inoculum from step A to the sterile medium prepared in this step. Ferment the mixture at about 34C with aeration at about 5 liters/minute, agitation at about 500 rpm until a packed cell volume of at least l5-20 percent is attained (22-26 hours). C. Antibiotic Production Stage Prepare and sterilize 90 liters of fermentation medium containing the following nutrients: Soybean meal (3.15 kg); dextrin (4.5 kg.); cerelose (450 gm.); cobalt chloride (200 mg); calcium carbonate (630 gms.); (TIE-60 antifoam (l00 ml.) and water to 90 liters, Adjust the post sterilization pH to 7.3 with dilute acid or alkali as required. Cool the medium to about 34C and, under sterile conditions, add 6 liters of inoeulum prepared in step B. Ferment the mixture at 34C with aeration at about 1.2 cu. ft./minute, agitation at from about 200 to about 400 rpm. and at a pH ranging from about 6.7 to about 8.3. Assay the fermentation after 24 hours, again after 48 hours and at 12 hour intervals thereafter until peak production is reached. lsolate the products by the procedure described in Example 2.

' EXAMPLE 2 Isolation of the Antibiotic Mixture Add 630 gms. of oxalic acid to the fermentation medium with agitation and adjust the mixture to pH 2 using 6N sulfuric acid. Agitate the mixture for about 20 minutes and filter. Wash the mycelial cake with water and combine the washing and the filtered broth. Neutralize the combined filtrate and washes with 6N ammonium hydroxide. Adsorb the antibiotic complex on [RC-50 resin in the ammonium form by passing the neutral broth through a column of resin which is about 2 inches in diameter and about 26 inches in height. Wash the resin bed with deionized water until the residual broth is removed (washes are free of color), elute the column with 2N ammonium hydroxide until the effluent is strongly basic {c.g. pH or above) and wash with deionized water.

Pass the elute and washes through a previously prepared column of IRA-401$ resin (hydroxyl cycle) to decolorize, the column having at least the dimensions described above for the [RC-50 column. The effluent and washes from the IRA-4018 column are combined and concentrated in vacuo to about 4.3 liters. Lyophilize 100 ml. of the concentrate to obtain 1.6 gms. of Antibiotic .llcomplex assaying 59] meg/mg. (vs. S. aureus, gentamicin 1000).

EXAMPLE 3 Separation of the Antibiotic Mixture Chromatograph 1.5 gms. of the antibiotic mixture obtained in Example 2, on a column of silica gel. As the eluent, use the lower phase of a l:l:l chloroformmethanolconcentrated ammonium hydroxide system.

EXAMPLE 4 Preparation of Antibiotic J I-20 Complex Sulfate Dissolve 7.5 g. of Antibiotic .Il-20 complex as prepared in Example 2 in 60 ml. of water and adjust the pH to about 4.0 by the addition of l'ZN sulfuric acid. Add decolorizing charcoal and stir for 30 minutes. Filter the solution and pour into 650 ml. of methanol. Collect the product by filtration, wash with methanol and dry under reduced pressure at about 55C to obtain the product of this example, [a],, 19 (water), bioassay 516 meg/mg.

EXAMPLE 5 Preparation of Antibiotic Jl-20 Complex Hydrochloride Dissolve 2.0 g. of Jl-20 complex in 15 ml. of water and add 6N hydrochloric acid dropwise with stirring to pH 3.6. Add decolorizing charcoal and stir for 15 minutes. Filter the solution and pour the filtrate into 500 ml. of acetone. Decant the supernatant liquid from the resulting precipitated gum. Dissolve the residual gum in water and lyophilize to obtain the desired material, m.p. 2082l3 dec., [a],, +l28 (water).

EXAMPLE 6 Preparation of Antibiotic .ll-20B Sulfate Dissolve 3 g. of Jl-20B in 24 ml. of water and adjust the pH to about 4.0 by the addition of 6N sulfuric acid. Add decolorizing charcoal and stir for 30 minutes. Filter the solution and pour into 250 ml. of methanol. Filter off the precipitated product, wash with methanol and dry under reduced pressure to obtain the desired sulfate salt, [11],? +l20 (water), bioassay 758 meg/mg.

EXAMPLE 7 Preparation of Antibiotic .ll-20A Sulfate According to the procedure of example 6, add sulfun'c acid to an aqueous solution of 1.5 g. of JI-20A and isolate the desired sulfate as described, [04],, +1 15 (water), bioassay 458 meg/mg.

EXAMPLE 8 Salicylaldehyde Schiff Base-Oxazolidine Derivative of .Antibiotic .ll-20B Stir 250 mg. of .II-20B in 10 ml. of anhydrous ethanol and add 0.4 ml. of salicylaldehyde. Stir for about 48 hours, then concentrate the reaction mixture to about 5 ml. under reduced pressure and pour into ml. of water. lsolate the precipitate by filtration, wash with water and dry under reduced pressure to obtain the EXAMPLE 9 Benzaldehyde Schiff Base-Oxazolidine Derivative of Antibiotic JI-20B EXAMPLE 1O p-Chlorobenzaldehyde Schiff Base-Oxazolidine Derivative of Antibiotic Jl-2OB Stir 250 mg. of Jl-2OB in ml. of anhydrous ethanol and add 425 mg. of p-chlorobenzaldehyde. Stir for 24 hours, concentrate to about 2 ml. under reduced pressure, dilute with 2 ml. of methanol and pour into 50 ml. of stirred water. Isolate the resulting precipitate by filtration, wash with water and dry under reduced pressure to obtain the title compound, m.p. 16ll65, [a],, +l47 (ethanol).

EXAMPLE 1 l Propionaldehyde Schiff Base-Oxazolidine Derivative of Antibiotic Jl-2OB Heat 1.0 g. of Jl-20B in 20 ml. of anhydrous ethanol to about 75 and add 0.9 ml. of propionaldehyde. Heat the mixture at about 75 for 18 hours, then concentrate to about 4 ml. under reduced pressure. Add the conare of particular advantage for preparing non-aqueous topical formulations since such derivatives exhibit compatibility with the pharmaceutical carriers generally used in such preparations.

When administered orally the antibiotics of this invention may be compounded in the form of tablets, capsules, elixirs or the like or may even be admixed with animal feed. lt is in these dosage forms that the antibiotics are most effective for treating bacterial infections of the gastrointestinal tract, which infections cause non-specific diarrheas. When the animal species are being treated orally, the antibiotics of this invention are administered at from about 5 mg. to about mg. per kilogram of body weight per day, preferably divided into from about 2 to about 4 doses.

in general, the topical preparations will contain from about 0.1 to about 3.0 gms. of antibiotic per 100 gms. of ointment, cream or lotion. The topical preparations are usually applied gently to lesions from about 2 to about 5 times a day.

The antibiotics of this invention may be utilized in liquid form such as solutions, suspensions, and the'like for otic and optic use and may also be administered parenterally via intramuscular injection. The injectable solution or suspension will usually be administered at from about 2 mg. to about 15 mgs. of antibiotic per kilogram of body weight per day divided into about 2 to ato ut 4 doses. The precise dose depends on the stage and severity of the infection, the susceptibility of the infecting organism to the antibiotic andthe individual characteristics of the animal species being treated.

The following examples are to exemplify some of the dosage forms in which the antibiotics of this invention and their derivatives may be employed:

EXAMPLE 12 Tablet 10 mg. Tab. 25 mg. Tab. 100 mg. Tab.

Antibiotic Jl-20 complex 10.50 mg. 2625 mg. 105.00 mg. Lactose. impalpable powder 197.50 mg. l7l,25 mg. 126.00 mg. Corn Starch 25.00 mg. 5.00 mg. 35.00 mg. Polyvlnylpyrrolidone 7.50 mg. 7.50 mg. 7.50 mg. Magnesium Stearatc 2.50 mg. 2.50 mg. 3.50 mg.

5% excess Procedure centrated solution dropwise to 200 ml. of stirred ether and isolate the resulting precipitate by filtration. Wash the precipitate with ether and dry to obtain the compound of this example, m.p. l63l68, [01],, +68 (ethanol).

By replacing Antibiotic Jl-ZOB in examples 8 through 1 1 inclusive with an equivalent quantity of Antibiotic .ll-20A or Antibiotic-Jl-2O complex and by following the process of the respective examples, the corresponding Schiff base-oxazolidine derivatives of Antibiotic .11- 20A or of Antibiotic Jl-20 complex may be prepared.

Antibiotic 31-20 complex, the components thereof and/or the above-described acid addition salts or Schiff base-oxazolidine derivatives thereof may be administered orally. They may also be applied topically in the form of ointments, both hydrophilic and hydrophobic, in the form of lotions which may be aqueous. nonaqueous or of the emulsion type or in the form of creams. Pharmaceutical carriers useful in the preparation of such formulations will include, for example, such substances as water. oils, greases, polyesters, polyols and the like. The Schiff base-oxazolidine derivatives Prepare a slurry consisting of the Antibiotic 11-20 50 complex, lactose and polyvinylpyrrolidone. Spray dry the slurry. Add the corn starch and magnesium stearate. Mix and compress into tablets.

Procedure Mix the Antibiotic .ll-20B (sulfate), lactose and a portion of the corn starch in a suitable mixing bowl. Prepare a paste of a portion of the corn starch and the EXAMPLE l4 Ointment Antibiotic .Il-A (Base) LU gm. Methyl parahen U.S.P. 0.5 gm. Propyl paraben U.S.P. 0.1 gm. Pctrolntum to 1000 gm.

Procedure 1. Melt the petrolatum.

2. Mix the Antibiotic .lI-ZOA, methyl paraben and propyl paraben with about 10 percent of the molten pctrolatum.

3. Pass the mixture through a colloid mill.

4. Add the remainder of the pctrolatum with agitation and cool the mixture until it becomes semisolid. At this stage the product may be put into suitable containers.

Ointments of Antibiotic .ll-20B, Antibiotic .ll-20 complex or Schiff base-oxazolidine derivatives of such antibiotics or acid addition salts thereof may be prepared by substituting an equivalent quantity of antibiotic, or derivative or acid addition salt for Antibiotic .lI-20A in the foregoing example and by following substantially the procedure of the example.

water for injection and agitate until homogenous.

Under sterile conditions, filter the solution through a suitable bacteria retentive filter collecting the filtrate in a filling tank.

Fill the filtrate aseptically into sterile pyrogen free multiple dose vials, stopper and seal.

In like manner, injectable solutions of Antibiotic .ll- 20A, Antibiotic Jl-2O complex and especially acid addition salts of such antibiotics may be prepared by substituting an equivalent quantity of such compounds for Antibiotic .ll-20B sulfate and by following the procedure set forth above.

We claim:

1. A compound selected from the group consisting of and the acid addition salts thereof wherein R is hydrogen in Antibiotic Jl-2OA and methyl in Antibiotic JI- Water. U.S.P q.s.

Includes a 5/( manufacturing overcharge Procedure For a 50.0 liter batch Charge approximately liters of water for injection m to a suitable stainless steel jacketed vessel and heat to about 70C. Charge the methylparaben and propylparaben to the heated water for injection and dissolve with agitation. When the parabens are completely dissolved,

cool the contents of the tank to 2530C by circulating 2. A compound according to claim 1 wherein R is hydrogen, said compound being Antibiotic Jl-2OA.

3. A compound according to claim 1 wherein R is ethyl, said compound being Antibiotic 11-208. 4. A compound according to claim 1, said compound being an acid addition salt of Antibiotic 11-203.

5. A compound according to claim 1, said compound being an acid addition salt of Antibiotic Jl-20A.

6. A compound according to claim 3, said compound being Antibiotic JI-20B sulfate.

7. A compound according to claim 4, said compound being Antibiotic Jl-2OA sulfate.

8. A compound selected from the group consisting of compounds having the formula:

N=CHR1 0 l 1L OH HO Rl CH3 R1HC=NCHR =CHR1 ylidene radical containing 7 to 12 carbon atoms; or an aromatic-heterocyclic radical containing 6 to 12 carbon atoms. 

1. A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ANTIBIOTIC JI-20A AND ANTIBIOTIC JL-20B, HAVING THE FORMULA:
 2. A compound according to claim 1 wherein R is hydrogen, said compound being Antibiotic JI-20A.
 3. A compound according to claim 1 wherein R is methyl, said compound being Antibiotic JI-20B.
 4. A compound according to claim 1, said compound being an acid addition salt of Antibiotic JI-20B.
 5. A compound according to claim 1, said compound being an acid addition salt of Antibiotic JI-20A.
 6. A compound according to claim 3, said compound being Antibiotic JI-20B sulfate.
 7. A compound according to claim 4, said compound being Antibiotic JI-20A sulfate.
 8. A coMpound selected from the group consisting of compounds having the formula: 